JP3060495B2 - Rotating head video tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention sequentially records recording tracks in a state where recording areas are different from each other and a first recording area and a second recording area are continuous with each other on a magnetic recording medium. A rotary head type video tape recorder configured to form a recording track in a state where a previous audio signal collected from the front of the video tape recorder and an audio signal collected from the rear thereof are continuously formed. The present invention relates to a rotary head type video tape recorder suitable for recording data separately in a first recording area and a second recording area.

[Summary of the Invention]

The present invention relates to a rotary head type video tape recorder in which recording areas are different from each other and recording tracks in a state where a first recording area and a second recording area are continuous are sequentially formed. In the recording area, one of the previous audio signal collected from the front of the video tape recorder and the audio signal collected from the rear simultaneously with the previous audio signal is recorded, and the second recording area When the other of the pre-audio signal and the post-audio signal is recorded and reproduced at the same time, the first recording area and the second recording area formed by making the recording areas different and continuous are simultaneously reproduced temporally. Signal delay means for correcting a reproduction time difference caused by the lack of reproduction, and a signal delay occurring between the preceding audio signal and the following audio signal is corrected. Even in the case of a rotary head type video tape recorder in which recording tracks in which the first recording area and the second recording area are continuous with different areas are sequentially formed, the reproduced pre-audio signal and the It is possible to reproduce a realistic sound signal from each of the audio signals.

[Conventional technology]

In recent years, a small video cassette similar to the compact cassette widely used for recording and reproducing audio signals is used, and the long recording time or the recording time length of the video signal that has been realized by the previous video cassette is used. For the purpose of realizing the above, a rotary head type video tape recorder using a new recording / reproducing format of a video signal and an audio signal has been proposed.

In this rotary head type video tape recorder, a first recording area for recording a one-field period of a video signal and a two-channel audio signal for the one-field period as an FM modulation signal, and a two-channel period for the one-field period A single recording track formed by connecting a second recording area for recording a compression-coded PCM audio signal as a compression-coded audio signal with different recording areas is used as a unit recording track, and magnetic recording is performed by a rotating head. This unit recording track can be sequentially recorded on the medium, and when the signal thus recorded is reproduced, the information is recorded by the FM recording method.
The audio signal for the channel and the PC with this signal compressed
The audio signals for two channels recorded by the M recording method are selected from the reproduced signals and can be listened to.

[Problems to be solved by the invention]

However, in the conventional rotary head type video tape recorder, the audio signal for one field of the video signal and the audio signal for two channels in the one field period are FM
This 1st recording area is recorded as a modulated signal.
Since the second recording area for recording the audio signal for the two channels in the field period as the PCM audio signal which is compression-encoded is formed in a state where the recording areas are different and continuous, the first recording is performed. The reproduced audio signal of the audio signal recorded in the second recording area is delayed by one field period with respect to the reproduced audio signal of the audio signal recorded in the area. Therefore, when a multi-channel audio signal is recorded simultaneously using both the first recording area and the second recording area, the audio signal obtained by reproducing the first recording area and the second recording area are used. There is a problem that a delay of one field period occurs between audio signals obtained by reproducing the area.

Therefore, the conventional rotary head type video tape recorder has a disadvantage in that it is not possible to obtain a realistic sound.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an excellent rotary head type video tape recorder capable of effectively recording front and rear sounds and obtaining a realistic sound. is there.

[Means for solving the problem]

The present invention relates to a rotating head type video tape recorder in which recording tracks are formed in a state where the recording areas are made different from each other and the first recording area and the second recording area are continuously formed. A first stereo microphone that picks up sound in front of the rotary head type video tape recorder and generates a pre-sound signal, a second stereo microphone that picks up sound behind and generates a post-sound signal,
Either one of the preceding audio signal and the following audio signal is recorded in the first recording area, and the other of the preceding audio signal and the following audio signal is recorded in the second recording area. Recording means for recording in an area, and a signal delay for correcting such that a relative time difference does not occur between a front audio signal and a rear audio signal obtained by reproducing each of the first recording area and the second recording area. And a signal.

[Action]

According to the rotary head video tape recorder of the present invention in which the recording areas are made different from each other and the recording tracks are sequentially formed with the first recording area and the second recording area being continuous. A signal delay occurring between a previous audio signal recorded in one of the area and the second recording area and an audio signal recorded in the other of the first recording area and the second recording area is corrected. By providing the signal delay means for correction, the relative time difference between the audio signal obtained by reproducing the first recording area and the audio signal obtained by reproducing the second recording area is reduced. The problem that the signal phase relationship between the audio signal recorded in the first recording area and the audio signal recorded in the second recording area is not correctly reproduced is solved. 2
When the pre-audio signal and the post-audio signal are recorded and reproduced using the recording area of, a realistic sound can be obtained.

〔Example〕

An embodiment of a rotary head type video tape recorder according to the present invention will be described below with reference to FIGS.

Figure 1, in FIG. 2, (10) is a video camera which outputs a video signal S ₁₀ by imaging an object. In addition (1
4) the microphones (14a), a first stereo microphone consisting of (14b), the imaging direction of the video camera (10), i.e., before and collecting front direction of the voice sound signal S _14a, outputs S _14b I do.

Reference numeral (16) denotes a second stereo microphone comprising microphones (16a) and (16b), and a video camera (1).
The audio signals S _16a and S _16b are output after the opposite direction of the imaging direction of 2), that is, the sound in the rear direction is collected.

Furthermore, the video signal S ₁₀ and the audio signal before S _14a, S _14b and the rear sound signal S _16a, the S _16b are input terminals _{T 1, T 2, T 3} , T 4, husband T ₅ s supplied by magnetic tape Tp A recording unit (20) for recording is provided.

This recording unit (20) is supplied with a video signal S _10, for example, a video signal processor for performing signal processing of the NTSC system (2
It includes a 2), a known color video signal from which a video signal S ₂₂ obtained by superimposing a tracking signal or the like is output.

Further, the previous audio signals S _14a and S _14b are respectively an amplifier (24a),
(24b), and after being amplified there, is supplied to an AFM stereo signal processing unit (26). Multiple stereo audio signal S ₂₆ is outputted therefrom.

An amplifier (30) to which the rear audio signals S _16a and S _16b are supplied.
a) and (30b) are provided, and low-pass filters (LPF) (32a),
(32b) is provided. Where (LPF) (32a), (3
2b) limits the band from 1 KHz to 10 KHz, and blocks operation noise and mechanical noise from the second stereo microphone (16). The signals from the LPFs (32a) and (32b) are supplied to the PCM processing unit (34).

In the PCM processing unit (34), the input signal is converted into a digital signal, divided into 132 blocks, for example, in an 8 mm VTR format, and P and Q parities for error correction are generated. Further, the signal for one field period is time-axis compressed to 1/5, and a block synchronization signal and a block address signal are added to each block.
Here, one block includes a 3-bit block synchronization signal, an 8-bit block address word, an error correction parity word, and a 163-bit CRC code for error detection. Thus multiple audio signal S ₃₄ which is modulated in PCM code obtained by are combined by the combining unit (38), followed by being supplied to the rotary head (42) through a recording amplifier (40), 221
It is recorded on the wound magnetic tape Tp.

FIG. 3 shows recording tracks Tr ₁ , Tr ₂ ,... Tr on the magnetic tape Tp.
Indicates _n . Here, the angular range of 36 degrees from the start of the trace is the first recording area PA, and the subsequent angular range of 180 degrees is the second recording area AV. In this case, the angular ranges PA and AV include the video signal S ₂₂ from the video signal processing unit (22), the stereo audio signal S ₂₆ from the AFM stereo signal processing unit (26), and the PCM.
Processing unit (34) equal alternately or superimposed to the audio signal S ₃₄ will be described later since stored. The operation control signal C _22, C ₂₆ and C ₃₄ of the recording of time is input, the video signal processing unit (22), AFM stereo signal processing unit (26) and the PCM processor time axis of the operation of (34) This is performed by dividing and further synthesizing the respective signals on the time axis in the synthesizing section (38).

Subsequently, a recording operation in the first recording area PA and the second recording area AV of the magnetic tape Tp in the above configuration will be described.

A multiplexed audio signal S ₃₄ modulated by a PCM code, that is, a post-audio signal is recorded in a first recording area PA, and a video signal S ₂₂ and a stereo audio signal are recorded in a second recording area AV.
S ₂₆ , that is, the previous audio signal is simultaneously multiplexed and recorded.
In this case, first, PCM processor output (34), by an angle ranging content of 36 degrees with the operation control signal C ₃₄ which is supplied to the output, followed by the video signal processing section and (22) AFM stereo signal the output of the processing unit (26), may be operated by the operation control signal C _22, C ₂₆ supplied by simultaneously 180 ° angular range fraction of the subsequent.

Furthermore, the first and second stereo microphones (1
4) The sound of each output signal from (16) from the front or rear direction can be recorded in the desired first and second recording areas.
PA and AV can be selected and recorded. In this case, the signal of the stereo microphone (14) is input to the input terminals T ₄ , T
_It is sufficient to provide a switch for supplying the signal to the input terminal T ₂ and the signal for the stereo microphone (16) to the input terminals T ₂ and T _{3. With} this configuration, various recordings can be performed, and the degree of freedom of recording can be obtained.

Further, when sound is reproduced from the first and second recording areas PA and AV, a time difference occurs. That is, the reproduction signal from the first recording area PA is delayed with respect to the reproduction signal from the second recording area AV. For example, an 8 mm VTR causes a delay of one field period. In this case, by recording the rear direction sound from the second stereo microphone (16) in the first recording area PA, the rear direction sound having much reverberation sound and the like may be a problem of a time difference from the front direction sound. Not to occur. Further, a delay circuit may be provided to delay by one field period so that the time axes are coincident and recorded.

In this way, by recording the front and rear sounds, the front and rear sounds can be effectively recorded, and a realistic sound can be obtained.

It is apparent that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

〔The invention's effect〕

As will be understood from the above description, the rotary head type video recording apparatus according to the present invention in which the recording areas are different from each other, and the recording tracks in which the first recording area and the second recording area are successively formed is sequentially formed. According to the tape recorder, the first
Between the previous audio signal recorded in any one of the recording area and the second recording area and the audio signal recorded in another of the first recording area and the second recording area. By providing a signal delay means for correcting the signal delay, the signal delay is corrected, so that the signal between the audio signal recorded in the first recording area and the audio signal recorded in the second recording area is The problem that the signal phase relationship is not reproduced correctly is solved, and there is an advantage that a realistic sound can be obtained without providing a rotary head or a fixed head for recording and reproducing an audio signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a rotary head type video tape recorder according to an embodiment of the present invention, FIG. 2 is a side view showing the appearance of the configuration shown in FIG. 1, and FIG. FIG. 3 is a diagram showing recording tracks on a magnetic tape provided by the present invention. (10) is a video camera, (14) is a first stereo microphone, (16) is a second stereo microphone, (20)
Is a recording unit, (22) is a video signal processing unit, (26) is an AFM stereo signal processing unit, (34) is a PCM processing unit, (38) is a combining unit, (42) is a rotating head, Tp is a magnetic tape, PA is the first recording area, AV is the second recording area, C ₂₂ , C ₂₆ , and C ₃₄ are operation control signals, S ₁₀ is a video signal, S ₂₂ is a video signal, S ₂₆ is a stereo audio signal, and S ₃₄ Is an audio signal.

Claims (2)

(57) [Claims] 1. A rotary head type video tape recorder in which recording tracks formed in a state where a first recording area and a second recording area are made continuous by making recording areas different from each other are sequentially formed. A first stereo microphone that picks up sound in front of the head type video tape recorder and generates a pre-sound signal, and a second stereo microphone that picks up sound behind and generates a post-sound signal.
A stereo microphone, and any one of the front audio signal and the rear audio signal is recorded in the first recording area, and the other audio signal of the front audio signal and the rear audio signal is recorded. Recording means for recording in the second recording area; and a relative time difference occurs between the previous audio signal and the rear audio signal obtained by reproducing each of the first recording area and the second recording area. Signal delay means for compensating for the absence of the signal, and the preceding sound obtained from each recording track of the first recording area and the second recording area formed in a state where recording areas are different from each other and are continuous. A rotary head type video tape recorder characterized in that a relative time difference is not generated between a signal and a rear audio signal. 2. The rotary head type video tape recorder according to claim 1, wherein a frequency of said rear audio signal picked up by said second stereo microphone which picks up a sound behind said rotary head type video tape recorder. Frequency band limiting means for band limiting is provided to reduce the effect of noise generated by the rotary head type video tape recorder on audio signals picked up by the second stereo microphone. The rotary head type video tape recorder.